Insulation mounting



Dec. 26, 1922.

L. F. BIRD. INSULATION MOUNTING- FILED FEB. 25. 1921.

Patented Dec. 26, 1922.

UNITED STATES LESTER I. BIRD, OF SEATTLE, WASHINGTUN.

INSULATION MOUNTING.

Application filed February 25, 1921. Serial Ira-447,724.

To all whom it may concern:

Be it known that I, LESTER F. BIRD, citizen of the United States,residing at Seattle, in the county of King and State of NVashin'gton,have invented certain new and useful Improvements in InsulationMountings, of which the following is a specification.

This invention relates to insulation mounting and is particularlydirected to insulation mounting for Winding of low capacity and lowinductance electrical resistance.

An object of the'invention is to provide a simplified form of insulationmounting for low capacity and low inductance resistances and in the formof a unit, for the purpose of simplification of'assembly, inspection andreplacement.'

In accordance with the most preferred form of the invention, the wiringconstituting the low capacity or. low in uctance, or both, is wound on asuitable substantially rigid insulating support, such as insulationfibre, board, micarto board or the like, such rigid insulating supportbeing notched at correspondingly opposite locations along the lateraledges and the electrical wire threaded through such notches to presentsubstantially parallel lengths of the wire on one face of the support,the connecting lengths of the wire being passed fromone notch to thesucceeding notch and on the opposite face of the support.

Further features and objects of the invention will be more fullyunderstood from the following detailed description and the accompanyingdrawings,'in which- Fig. 1 is a front elevation of the preferred form ofthe invetion; and

Fig. 2 is a side elevation of'the same.

Referring to the drawings, the support 1 is of any suitablesubstantially rigid insu lating material, such as a sheet of insulationfibre, insulation board, micarto board, or the like. For usual purposes,such support is substantially rectangular in contour. Along the lowerlateral edge, 2, is provided notches 3, 3, and along the upper lateraledge 1 are provided the similar notches 5, 5, the corresponding notchesof the opposite edges being in alignment. Preferably, such notches 3, 5are disposed respectively at equal distances from either end edge 6, 7,of the support 1. Such notches may be stamped in when dieing out thesupport 1 or may be cut into the formed support.

face of the support 1; then through the first lower notch 3, then for arelatively short portion 14 on the rear face of the support 1 andthrough the next lower notch 3; then for a relatively short portion 12along the rear face of the support 1, and containing similarly asaforesaid through pairs of notches alternatively at the upper and lowerlateral edges to provide a series of relatively long portions arrangedsubstantially parallel to one another on one face of the support untilthe other end 11 of the wire pass-' ing through the other opening 10.

The support'l may he'provided with a mounting bracket 17, preferablyextending on the rear face of thesupport, which mounting bracket 17serves also to stiffen the fibre, board or the like constituting thesupport, against any tendency of the wound wire portions to collapse thefibre or board. Asshown, each bracket 17 consists of v a rectilinearbody portion and end lugs or end portions bent at right angles to thebodyportion, such end lu or end bent portions being inserted in suitableopenings in the support 1' either in snug fit therewith or held thereinby swaging er -otherwise. The

efl'ective lengths of the end lugs or bent end portions are sufficientlylong to position the .body portion of each bracket 17 beyond the wireportions 12, 14, disposed on the rear face of the support 1 asaforesaid, to guard against short circuiting and to provide an airclosure for-proper cooling of such portions, of the resistance wire.

From the above it will" be noted that the major portions of the wire arealigned substantially wholly on one face of the insulation support, tofacilitate inspection inv the event of breakage and to rovlde for propercooling, as such face of tie support-is usually positioned to be exposedto cooling.

The invention also provides a mountin for resistance in the form of aunit whie 11o can be readily positioned and readily removed for thepurpose of inspection and replacement if necessary.

This form of mounting for electrical Wiring is particularly adapted forlow capacity resistance, low inductance I resistance and; similarelectrical resistance wiring.

Whereas Ihave described my invention by reference to specific formsthereof it will be understood that many changes and modifications may bemade VVlllhQlli; departing from the spirit of the invention as definedby the appended claim,

l". claim,

An. electrical resistance unit comprising a base of insulation materialprovided with means? a series of notches arranged at uniform distancesfrom one another at one lateral edge of said base and with a series ofnotches arranged at uniform distances from one another at the oppositeedge of said base, said base being further provided with endperforations, an electrical Wire having its 0pposite ends threadedthrough said perforations and its intermediate portion threadedsuccessively through pairsof said notches at the opposite edgesalternatively, and stiffening and supporting means for said base.

In testimony whereof I have aifixed my signature LESTER- ?e sin-n.

